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Security of Electronic Documentation in Medical Environment
Hauserová, Markéta ; Malinka, Kamil (referee) ; Barabas, Maroš (advisor)
Thesis is analyzing czech laws which are related to medical documentation. Describes the points which are mandatory for information system, so the medical documentation can be stored electronically. Includes various algorithms for implementation of certain electronic signature and for identification of person. This thesis deals with asymmetric cryptography, specifically RSA, DSA, and ECDSA. Describes the hash functions and their functions and their characteristics. Describes the principle of the certificate, ways of its obtaining, invalidation and their formats. Analyzes medical information system and suggests ways to create a program for signing medical records. Then based on that analysis, the program is implemented. At the conclusion of the work is discussed, if created program meets the criteria.
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Bitcoin Mining Acceleration
Novotný, Jan ; Veselý, Vladimír (referee) ; Kajan, Michal (advisor)
This master's thesis deals with virtual currency called Bitcoin. It describes the functioning of the currency of technical perspective especially the implementation of the transaction, the way of its validation and ensuring the integrity by using cryptographic functions. Furthermore, it describes the principle of the Bitcoin creation, particularly mining method called pooled mining. The thesis also describes the communication protocols and design of architecture to acceleration of the bitcoin mining. Finally, there are described tests, assessment and proposals for the continuation of work.
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Safe Cryptography Algorithms
Mahdal, Jakub ; Hanáček, Petr (referee) ; Chmelař, Petr (advisor)
This thesis brings a reader an overview about historical and modern world of cryptographic methods, as well evaluates actual state of cryptographic algorithm progressions, which are used in applications nowadays. The aim of the work describes common symmetric, asymmetric encryption methods, cryptographic hash functions and as well pseudorandom number generators, authentication protocols and protocols for building VPNs. This document also shows the basics of the successful modern cryptanalysis and reveals algorithms that shouldn't be used and which algorithms are vulnerable. The reader will be also recommended an overview of cryptographic algorithms that are expected to stay safe in the future.
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Secured access for web applications
Humpolík, Jan ; Pelka, Tomáš (referee) ; Doležel, Radek (advisor)
This thesis mainly concerns often neglected security part of each web application, but also secure access users themselves. Describes theoretically and practically modern security technology, on a web application being tested and shows a possible way of defense. Gives instructions for installing its own web server.
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Realization of attack on SHA-1 hash function
Dziura, Michal ; Hajný, Jan (referee) ; Malý, Jan (advisor)
The bachelor thesis is concerned with hash functions, SHA-1 function and its implementation in Java. The thesis describes weaknesses of this function and implements the implementation of the selected attack leading to the revelation of source text or attack based on targeted falsifying hash. This work also describes characteristics of hash functions, constructions and their use. The last part deals with a description of the attack on the hash function SHA-1 with the complexity of the 2^69.
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Performance tests of cryptographic algorithms
Pospíšil, Karel ; Martinásek, Zdeněk (referee) ; Sobotka, Jiří (advisor)
Bachelor's thesis deals with analysis of the various cryptographic algorithms that are used for securing communications. The first part is devoted to symmetrical cryptographic algorithms, asymmetric cryptographic algorithms and hashing functions. The second part deals with the security classification and attacks that are used to attack cryptographic algorithms and hash function. The third part deals with the selected testing algorithm RC4 and MD5 hashed function for using CrypTool. The final section provides an evaluation and test results of algorithm RC4 and MD5 hashing function.
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Implementation of modern hash functions
Trbušek, Pavel ; Sobotka, Jiří (referee) ; Stančík, Peter (advisor)
Master's thesis analyses modern hash functions. The requirements for these features and briefly outlined some of the types of attacks are given in the first part. The second part focuses on the specication Skein hash function, which is among the candidates for the new SHA-3 standard, and a description of the JCOP platform, which is a function implemented. In the last part of the work there are discussed implementation problematic parts and evaluation of the selected solution.
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Hash functions and their usage in user authentication
Piller, Igor ; Stančík, Peter (referee) ; Hajný, Jan (advisor)
This thesis concerns with hash functions and their usage in authentication. It presents basics of hash functions theory and construction elements. In particular the thesis focuses on LMHash, MD4, MD5 and SHA family hash functions, which are compared from the security point of view. The thesis describes in general the most frequently used hash function attacks, points out the weaknesses of current construction and mentions the future perspective of hash functions. Furthermore the thesis outlines the area authentication and describes usage of hash functions in the area. Practical part of the thesis contains an implements of a general authentication framework implemented in programming language C#. The result is client and server applications, in which two selected authentication methods were successfully tested. The result implementation is flexible with respect to the possible future use of other authentication methods.
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Password deposition techniques in operating systems
Pavlík, Martin ; Růčka, Lukáš (referee) ; Hajný, Jan (advisor)
This master thesis deals with ways to store passwords in current operating systems. Specifically, this work focuses on Windows, Linux, BSD and OS X. These systems are examined for ways of hashing passwords and on resistance of resulting hashes against various attacks. First (theoretical) section describes the procedures and algorithms that are needed for user authentication. This part also describes methods of hash storing. At the end of the theoretical part are generally described some possible attacks against hash functions. In second (practical) part is described and tested tools for obtaining hashes of the investigated operating systems. Subsequently practical attacks were conducted against obtained hashes by using appropriate tools. Furthermore there are presented results of the attacks. In the conclusion of the work there is a comparison of tools and methods which were used to obtain plaintext passwords from operating systems.
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Cryptographic hash function
Čejka, Petr ; Ivánek, Jiří (advisor) ; Palovský, Radomír (referee)
The goal of this thesis is to create overview about cryptographic hash fiction. In the first part is explained what general hash function is with its use. Follows specification of cryptographic hash function with a description of the most common construction. The next chapter is focused on application of cryptographic hash function in practice with emphasis to digital signature. After this chapter is attention paid to security. At the end are presented the most popular and the most important representatives of cryptographic hash function.
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